The OpenCL flag is determined by Magick.NET/Imagemagick. The first time it runs it will start a performance measurement and determine what is faster. The outcome can be one of the following: GPU, CPU with OpenCL or just CPU. It looks like it has determined that it will use the OpenCL acceleration of your CPU (CPU with OpenCL). You can find the performance measurement details in the following file: %LOCALAPPDATA%.config\ImageMagick\ImagemagickOpenCLDeviceProfile.
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